How do I clear my DNS cache?

Document created by Digital Support on Nov 8, 2017Last modified by Digital Support on Nov 8, 2017
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Clearing your DNS cache, also call flushing DNS, requires two steps:
  1. Clearing the DNS cache on your computer.
  2. Clearing the DNS cache in your web browser(s).
You must have administrator privileges on your computer to clear the DNS cache on your computer. If you don't because you're using a campus computer, for example, you'll need to work with your campus technical support or IT department.


Clear the DNS cache on your computer

Windows 7 and earlier versions

  1. Click the Start menu.
  2. Go to All Programs.
  3. Choose Accessories and right-click Command Prompt.
  4. Select Run as Administrator.
  5. Run the command ipconfig /flushdns and hit Enter.

Windows 8

  1. Press the Windows Key or hover your mouse over the bottom left corner and click the Windows Icon.
  2. Begin typing Command Prompt.
  3. Right-click the application and select Run as Administrator.
  4. Run the command ipconfig /flushdns and hit Enter.

OS X 10.4 TIGER

  1. Click the Terminal icon in the dock or in Finder under Application/Utilities/Terminal.
  2. Run the command lookupd -flushcache and hit Enter.

OS X 10.5 and 10.6 LEOPARD

  1. Click the Terminal icon in the dock or in Finder under Application/Utilities/Terminal.
  2. Run the command dscacheutil -flushcache and hit Enter.

OS X 10.7 and 10.8 Lion

  1. Click the Terminal icon in the dock or in Finder under Application/Utilities/Terminal.
  2. Run the command sudo killall -HUP mDNSResponder and hit Enter.

OS X 10.9 and 10.10.4 Yosemite, 10.11 El Capitan and 10.12 Sierra

  1. Click the Terminal icon in the dock or in Finder under Application/Utilities/Terminal.
  2. Run the following command:
sudo dscacheutil -flushcache
sudo killall -HUP mDNSResponder
  1.  Hit Enter.
If you have administrator rights on your computer, but you don't feel comfortable performing these actions, please call our technical support team so that an agent can walk you through.


Clear the DNS cache in your web browser(s)

Select your browser below to see instructions on clearing your DNS cache, which involves clearing your browser's history. If you use more than one browser, you should clear the history of each.

Chrome
Firefox
Safari
Edge
Internet Explorer
 

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